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Thursday, January 1, 2026

how to use the id selector in html and css

how to use the id selector in html and css

web designing theory

This Blog You Will Learn 

ஃ What is ID Selector ?

ஃ Syntax of HTML <id> tag

ஃ Explain Program

ஃ Output

What is ID Selector ?

✅ID selector is important tools in styling css specific elements in your web page.

✅class selectors used multiple element.

✅ ID Selector unique  element by id attribute.

✅ID selector Symbol  starts  hash  symbol #  .

✅ID selector unique on the entire page.

✅id selector value more than once document.

Syntax of HTML <id> tag


<element id="nuiquename">
.
. content write
. 
</element> Attribute provide additional information about element 
  1. id attribute unique on entire webpage
  2. id attribute name cannot start with number.
  3. id attribute name cannot space allowed.
  4. id attribute name no allowed space and use - or _ symbols

how to use the id selector in html and css

Explain Program

Step  1] 

<!DOCTYPE html>

  • This declare the document type.
  • browser that the document is written in html

Step 2 ]

<html>.... . </html>

  • html is the root element of the html page.
  •  Every thing inside it is part of the webpage.

Step 3]

<head>
     
  <title> HTML iframe tag </title>
<style>
            #header{
                 background-color: lightblue;
                 color: black;
                 text-align: center;
                 padding: 20px;
            }
        </style>

    </head>

  1.   <head>  section 

  •   head section contains metadata about page. not visible on the page itself.
  •  <title> tag  title section set the title of the page shows the browser tab. 

   2.    CSS Style  

      ✔  #header  { . . . } 

      ✔ # symbol represent  selecting id element .

     ✔ #header                    :-   HTML element .

     ✔ background-color    :-   set the background color.

     ✔ color                        :-  set text color.

     ✔ text-align : center    :-   text center element.

     ✔padding: 20px         :- 20 pixels of space inside element. (top, bottom, right, left)

Step 4]

<body>

  • < body> tag  contains all the content visible to webpage.
  • <body> tag contains  all the visible content of the page.
  • inside <body> show the browser screen.

Step 5]

 
    <body>
<h2 id="header"> HTML id Attribute</h2>
<p> HTML id attribute  use unique
name on webpage </p>
        </body>

       

  •   <h2>                 :-   heading tag .
  • <id="header">   :-   unique identifier name
  • CSS <style>      :-  section style element id.

                header  id attribute appears 

  •  background -color 
  • color
  • text-align
  • padding 

Step 6]

closing the Tag

</body>

 </html>

how to use the id selector in html and css
Example 


<!DOCTYPE html>
<html>
    <head>
        <title> HTML id Attribute </title>
        <style>
            #header{
                 background-color: lightblue;
                 color: black;
                 text-align: center;
                 padding: 20px;
            }
        </style>
    </head>
    <body>
        <h2 id="header"> HTML id Attribute</h2>
        <p> HTML id attribute  use unique
name on webpage </p>
       
    </body>
</html>


how to use the id selector in html and css
Output





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